It's safe to export the OBJ from DS as I do it the time, Poser figures usually load with a memorized pose, so you need to remember to zero the figure before you export.So my understanding from previous posts was the Studio would have the same issues exporting a posed figure for morph creation as Poser. Later posts suggest otherwise. I wouldn't mind exporting from Daz to create a Poser morph target. But I'd be using Blender. Is this not possible? Otherwise, maybe I can convince CC to sell me a copy of PML.
The OBJ export in DS allows you to export the mesh without the mesh groups, so it doesn't "really" matter if the mesh groups are welded or not.
Morph Loader also allows you to import an OBJ for morphs using just the vertex data, so as long as the vertex count and winding order are the same DS will create a working morph from it.
No idea about GoZ for DS/Poser as I don't have ZB, but if it's anything like the DS to Hexagon bridge, then mesh groups are not sent across the bridge, so you end up with just one item in the scene.